Resistance of Mexican Fruit Fly to Quarantine Treatments of High Hydrostatic Pressure Combined with Heat

Abstract

High-pressure processing (HPP) has been proposed as an alternative quarantine method against the Mexican fruit fly Anastrepha ludens Loew (Diptera: Tephritidae), which is one of the most important pests infesting mangoes, citrus, and other fruits in Mexico and other Latin-American countries. However, processing conditions used to destroy eggs and larvae also affect the shelf life of fruits. The objective of this study was to assess the biological viability of A. ludens eggs treated with HPP, establishing whether undestroyed eggs were able to develop larvae, pupae, and adults capable of reproduction. Eggs of 1, 2, 3, and 4 days old were pressurized at 50, 75, or 100 MPa for 0, 5, 10, or 20 min. The hatching ability of pressurized eggs; survivorship of third instars, pupae, and adults emerged; and their capability to produce viable eggs were examined. The results showed that the hatching capacity of eggs and the larval development were affected negatively by the treatment duration and level of pressure. Treatments with 100 MPa for 20 min inhibited the hatching capacity of eggs of 2, 3, or 4 days old by 100%, but the inhibition was of 99.8% for 1-day-old eggs. Most of the eggs that survived the treatments were able to produce adults that can reproduce. The percent of hatching of eggs of A. ludens oviposited for adults obtained from pressurized 1-day-old eggs treated with 100 MPa for 20 min was 64.81%. Thus, more efforts must be addressed to destroy eggs and larvae during HPP because surviving organisms can reach adult stage and reproduce.

Precooling Treatments Induce Resistance of <I>Anastrepha ludens</I> Eggs to Quarantine Treatments of High-Pressure Processing Combined With Cold

“…Pressure treatments were carried out as reported elsewhere (Candelario et al 2010). Brießy, a mixture of 5:1 water with crushed ice/anticorrosive lubricant (Hydrolubric 120-B; EF Houghton, Valley Forge, PA) was used as pressurizing ßuid to maintain a temperature near 0ЊC during treatments.…”

HIGH HYDROSTATIC PRESSURE INDUCES SYNTHESIS OF HEAT‐SHOCK PROTEINS AND TREHALOSE‐6‐PHOSPHATE SYNTHASE IN Anastrepha ludens LARVAE

“…() and Candelario et al. () evaluated the ability of HHP (25–150 MPa) in combination with heat treatment (50°C) to inactivate eggs and larvae of A. ludens . The authors reported that the combination treatment was effective to inactivate both larvae and eggs to 150 MPa, but below this pressure a large percentage of eggs and larvae were able to produce adult flies after treatment.…”

“…This pressure is transmitted in a uniform and instantaneous way, independent of the size, geometrical form or composition of the foodstuff (Cheftel, 1991;Parker and Mehta, 2007). Velazquez et al (2010b) and Candelario et al (2010) evaluated the ability of HHP in combination with heat treatment (50 • C) to inactivate eggs and larvae of A. ludens. The authors reported that the combination treatment was effective to inactivate both larvae and eggs to 150 MPa, but below this pressure a large percentage of eggs and larvae were able to produce adult flies after treatment.…”